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TK5551M-PP Datasheet(PDF) 8 Page - ATMEL Corporation

Part # TK5551M-PP
Description  Standard Read/Write ID Transponder with Anti-collision
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TK5551M-PP Datasheet(HTML) 8 Page - ATMEL Corporation

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8
4709F–RFID–06/06
TK5551
Measured write-time frames of the IDIC demo kit software are:
t
0
= 50 ms to 130 ms
t
1
= 270 ms to 390 ms
t
gap = 180 ms to 400 ms
Antennas with a high Q-factor require longer times for t
gap and shorter time values for t0 and t1.
Figure 10-1. Ideal and Real Behavior Signals
11. Operating Distance
The maximum distance between the base station and the TK5551 depends mainly on the base
station, the coil geometries and the modulation options chosen (see “U2270B Antenna Design
Hints” and the “U2270B” data sheet). Under laboratory conditions, a distance of up to 9 cm can
be reached. For optimized distance, please refer to the application note. When using Atmel’s
U2270B demo board, the typical distances in the range of 0 cm to 5 cm can be achieved.
11.1
Anti-collision Mode by Password Request (AOR = Answer-On-Request)
The AOR mode is an anti-collision procedure for transponders to read, e.g., 10 transponders in
the field during 500 ms (RF/32, maxblock 2). The number of transponders and the time to read
out are dependent on the application.
If the AOR mode has been configured by AOR bit at block 0, the transponder remains in sleep
mode while putting it into the field. If the specified AOR wake-up command is sent, the dedicated
transponder generates an internal RESET (see section “OP Code Formats” in the e5551 data
sheet). Due to the RESET the transponder is woken up. That means, the transponder is able to
modulate the field (read mode). The AOR wake-up command consists of the OP code and the
32-bit password. The time duration to send the AOR wake-up sequence is between 8.7 ms and
27.5 ms according to Figure 10-1. The time duration is dependent on the minimum/maximum
values of the measured write-time frames and the content of the password. To select another
transponder in the field, it is necessary to send the stop OP code to stop the modulation of the
transponder.
1
0
1
t
1
Gap detect
1
Gap detect
Ideal behavior
RF level reduces to zero immediately
Actual behavior
RF level decreases exponentially
Coil
voltage
1
0
Coil
voltage
t
gap
t
0
t
1
t
gap
t
0
t
1 internal
t
0 internal


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